/Engine/Source/Runtime/Experimental/Iris/Core/Public/Iris/ReplicationSystem/ObjectReplicationBridge.h
As the filtering is done at the serialization level it is typically more efficient to use a separate NetObject for connection specific data as filtering can then be done at a higher level.
void SetSubObjectNetCondition ( [FNetRefHandle](API\Runtime\IrisCore\Iris\ReplicationSystem\UReplicationBridge\FNetRefHandle) SubObjectHandle, ELifetimeCondition Condition )